如何从asp.net中的Gridview下载文件？ [英] How to download file from Gridview in asp.net?

问题描述

我想从各个用户上传的gridview链接按钮下载文件但是获得例外

'E：/Latest_jobportal/jvportal/Uploads/purushottam.kumar/purushottam.kumarCV.docx'是物理路径，但预计会有虚拟路径。

我的代码如下

 < span class =code-keyword> if （e.CommandName ==   cmd）
 {
  string  filename = e.CommandArgument.ToString（）; 
  if （filename！=  ）
 {
  string  path = MapPath（filename）; 
  byte  [] bts = System.IO.File.ReadAllBytes（path）; 
 Response.Clear（）; 
 Response.ClearHeaders（）; 
 Response.AddHeader（  Content-Type，  Application / octet-stream）; 
 Response.AddHeader（  Content-Length，bts.Length.ToString（）） ; 
 
 Response.AddHeader（  Content-Disposition，  attachment; filename = + filename）; 
 
 Response.BinaryWrite（bts）; 
 
 Response.Flush（）; 
 
 Response.End（）; 
} 
} 

}

解决方案

在cs文件中添加以下

  protected   void  DownloadFile（ object  sender，EventArgs e）
 {
 < span class =code-keyword> string  filePath =（sender  as  LinkBut​​ton）.CommandArgument; 
 Response.ContentType = ContentType; 
 Response.AppendHeader（  Content-Disposition，  attachment; filename = + Path.GetFileName（filePath））; 
 Response.WriteFile（filePath）; 
 Response.End（）; 
} 

在aspx文件中，在Gridview的列中添加Templatefiled

 <   asp：TemplateField     HeaderText   = 下载    HeaderStyle-Width   =  7％ >  
 < ;   ItemTemplate  >  
  <   asp：LinkBut​​ton     ID   =  lnkDownload   文字  = 下载    CommandArgument   ='  <％ #Eval（  FilePath）％> '    runat   =  server    OnClick   =  DownloadFile >  <   / asp：LinkBut​​ton  >  
 <   / ItemTemplate  >  
 <   / asp：TemplateField  >  

因为你已经有了真正的路径，所以你不需要 MapPath

  byte  [] bts = System.IO.File.ReadAllBytes（filename）; 

I want to download file from gridview link button uploaded by respective user but getting exception

'E:/Latest_jobportal/jvportal/Uploads/purushottam.kumar/purushottam.kumarCV.docx' is a physical path, but a virtual path was expected.

my code is as follows

if (e.CommandName == "cmd")
        {
            string filename = e.CommandArgument.ToString();
            if (filename != "")
            {
                string path = MapPath(filename);
                byte[] bts = System.IO.File.ReadAllBytes(path);
                Response.Clear();
                Response.ClearHeaders();
                Response.AddHeader("Content-Type", "Application/octet-stream");
                Response.AddHeader("Content-Length", bts.Length.ToString());

                Response.AddHeader("Content-Disposition", "attachment;   filename=" + filename);

                Response.BinaryWrite(bts);

                Response.Flush();

                Response.End();
            }
}

}

解决方案

In cs file add following

protected void DownloadFile(object sender, EventArgs e)
   {
       string filePath = (sender as LinkButton).CommandArgument;
       Response.ContentType = ContentType;
       Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(filePath));
       Response.WriteFile(filePath);
       Response.End();
   }

In aspx file add Templatefiled in Columns in Gridview

<asp:TemplateField HeaderText="Download" HeaderStyle-Width="7%">
                  <ItemTemplate>
                      <asp:LinkButton ID="lnkDownload" Text="Download" CommandArgument='<%# Eval("FilePath") %>' runat="server" OnClick="DownloadFile"></asp:LinkButton>
                  </ItemTemplate>
              </asp:TemplateField>

since you already has real path, you don't need MapPath

byte[] bts = System.IO.File.ReadAllBytes(filename);

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